Spring shackle and method of forming the same



A. C. WEBSTER. SPRING SHACKLE AND METHOD OF FORMING THE SAME.APPLICATION FILED APR. 30. I920.

1,432,648,, Patented Oct. 17,1922.

92, mm A41 I wmm,

Patented Oct; 17, 1922.

ARVIN C. WEBSTER, 015 DETROIT, MICHIGAN.

SPRING SHACKLE AND METHOD OF FORMING THE SAME.

Application filed April 30, 1920. Serial No. 377,941.

1 all whom it may concern:

Be it known that I, ARVIN C. Wises ER, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and State ofMichigan, have invented cer tain new and useful Improvements in SpringShackles and Methods of Forming the Same, of which the following is aspecification, reference being had therein to the accolapanyingdrawings.

The invention relates to the manufacture of spring shackles, springclips, etc, and it is the object of the invention to increase thestrength and to cheapen themannfad turing cost, as hereinafter set forthIn the drawings: a Figure 1 is an elevation of the blank from which theshackle is formed;

Figure 2 is a similar View showing aportion of the blank after thethreading operation;

Figure 3 is a View showing the blank after the first bending operation;

Figure 4 is a similar View showing the refashioned blank;

Figure 5 is a view similar to Figure 4,

i showing a modified construction designed for use as a spring clip.

In the construction of spring shackles, it is usual to provide twoparallely arranged pivot bolts connected to each other by bifurcatedlinks and respectively engaged with the spring and the supporting orsupported member. To permit of assein blii'ig and dismounting at leastone of the 7 links must be removable and securing means must be providedfor this removable link. l Vith the present invention the parallel pivotpins are formed from an integral blank, 40 the opposite ends of whichare threaded and the threading operation is preferably formed by rollingprior to the initial bending of the blank. In the process of manufacturethe first bending of the blank is into a U- shaped form, but in asubsequent operation this form is re-fashioned to produce asubstantially straight connecting link portion. In detail, A is a blankformed of straight round bar stock having end portions B and B reducedin diameter and threaded. Thisthread is preferably accomplished by arolling process and the blank is first reto form the shoulder D andshank portion D and this shank portion is then further erably the blankis first reduced in diameter threads are rolled. After the completion ofthe rolling of the threads, indicated at C, the external diameterthereof will correspond with the shank portion D, as indicated in Figure2. The blank is then bent into a Ushaped form, as indicated in Figure 3.It, is then placed in dies and swedged or refashioned to form of thebend a substantially straight link portion E having a longitudinalprojection upon one side there of and intermediate its ends tostrengthen the same the pivot pins F and F projecting therefrom inparallel relation to each other. The portion E when re-fashioned isenlarged transversely to the axis of the pins F and F so as to formprojecting shoulders.

in Figure 5 the construction is similar to that in Figure lwith theexception that the design is one adapted for use as a spring clip.

that I claim as my invention is:

l. A spring shackle comprising a cold swedged member having parallel pinportions and a connecting link portion.

2. A. spring shackle comprising a cold swedged member having parallelpin portions, a connecting link portion and rolled threads on the pinportions.

3. A spring shackle formed from a single piece of bendable materialcomprising a substantially straight linkportion having a longitudinalprojection upon one side thereof and intermediate its ends, and a pairof enlarged parallel cylindrical pin portions extending from theopposite side of the link portion adjacent to the opposite ends thereof,said pin portions having reduced shank portions intermediate their endsand terminating in reduced rolled threaded portions.

In testimony whereof I {till my signature,

ARVIN' C. WEBSTER.

reduced to form the portion C on which the 0

